<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id$

class Page extends Think {

  public $firstRow	; // 起始行数

  public $listRows	;// 列表每页显示行数

  public $parameter  ;// 页数跳转时要带的参数

  protected $totalPages  ; // 分页总页面数

  protected $totalRows  ; // 总行数

  protected $nowPage    ; // 当前页数

  protected $coolPages   ; // 分页的栏的总页数

  protected $rollPage   ;// 分页栏每页显示的页数
  // 分页显示定制
  protected $config  =	array('header'=>'条记录','prev'=>'上一页','next'=>'下一页','first'=>'第一页','last'=>'最后一页','theme'=>' %totalRow% %header% %nowPage%/%totalPage% 页 %upPage% %downPage% %first%  %prePage%  %linkPage%  %nextPage% %end%');

  /**
   +----------------------------------------------------------
   * 架构函数
   +----------------------------------------------------------
   * @access public
   +----------------------------------------------------------
   * @param array $totalRows  总的记录数
   * @param array $listRows  每页显示记录数
   * @param array $parameter  分页跳转的参数
   +----------------------------------------------------------
   */
  public function __construct($totalRows,$listRows,$parameter='') {
    $this->totalRows = $totalRows;
    $this->parameter = $parameter;
    $this->rollPage = C('PAGE_ROLLPAGE');
    $this->listRows = !empty($listRows)?$listRows:C('PAGE_LISTROWS');
    $this->totalPages = ceil($this->totalRows/$this->listRows);     //总页数
    $this->coolPages  = ceil($this->totalPages/$this->rollPage);
    $this->nowPage  = !empty($_GET[C('VAR_PAGE')])?$_GET[C('VAR_PAGE')]:1;
    if(!empty($this->totalPages) && $this->nowPage>$this->totalPages) {
      $this->nowPage = $this->totalPages;
    }
    $this->firstRow = $this->listRows*($this->nowPage-1);
  }

  public function setConfig($name,$value) {
    if(isset($this->config[$name])) {
      $this->config[$name]    =   $value;
    }
  }

  /**
   +----------------------------------------------------------
   * 分页显示输出
   +----------------------------------------------------------
   * @access public
   +----------------------------------------------------------
   */
  public function show() {
    if(0 == $this->totalRows) return '';
    $p = C('VAR_PAGE');
    $nowCoolPage      = ceil($this->nowPage/$this->rollPage);
    $url  =  $_SERVER['REQUEST_URI'].(strpos($_SERVER['REQUEST_URI'],'?')?'':"?").$this->parameter;
    $parse = parse_url($url);
    if(isset($parse['query'])) {
      parse_str($parse['query'],$params);
      unset($params[$p]);
      $url   =  $parse['path'].'?'.http_build_query($params);
    }
    //上下翻页字符串
    $upRow   = $this->nowPage-1;
    $downRow = $this->nowPage+1;
    if ($upRow>0) {
      $upPage="<a href='".$url."&".$p."=$upRow'>".$this->config['prev']."</a>";
    }else {
      $upPage="";
    }

    if ($downRow <= $this->totalPages) {
      $downPage="<a href='".$url."&".$p."=$downRow'>".$this->config['next']."</a>";
    }else {
      $downPage="";
    }
    // << < > >>
    if($nowCoolPage == 1) {
      $theFirst = "";
      $prePage = "";
    }else {
      $preRow =  $this->nowPage-$this->rollPage;
      $prePage = "<a href='".$url."&".$p."=$preRow' >上".$this->rollPage."页</a>";
      $theFirst = "<a href='".$url."&".$p."=1' >".$this->config['first']."</a>";
    }
    if($nowCoolPage == $this->coolPages) {
      $nextPage = "";
      $theEnd="";
    }else {
      $nextRow = $this->nowPage+$this->rollPage;
      $theEndRow = $this->totalPages;
      $nextPage = "<a href='".$url."&".$p."=$nextRow' >下".$this->rollPage."页</a>";
      $theEnd = "<a href='".$url."&".$p."=$theEndRow' >".$this->config['last']."</a>";
    }
    // 1 2 3 4 5
    $linkPage = "";
    for($i=1;$i<=$this->rollPage;$i++) {
      $page=($nowCoolPage-1)*$this->rollPage+$i;
      if($page!=$this->nowPage) {
        if($page<=$this->totalPages) {
          $linkPage .= "&nbsp;<a href='".$url."&".$p."=$page'>&nbsp;".$page."&nbsp;</a>";
        }else {
          break;
        }
      }else {
        if($this->totalPages != 1) {
          $linkPage .= "&nbsp;<span class='current'>".$page."</span>";
        }
      }
    }
    $pageStr	 =	 str_replace(
            array('%header%','%nowPage%','%totalRow%','%totalPage%','%upPage%','%downPage%','%first%','%prePage%','%linkPage%','%nextPage%','%end%'),
            array($this->config['header'],$this->nowPage,$this->totalRows,$this->totalPages,$upPage,$downPage,$theFirst,$prePage,$linkPage,$nextPage,$theEnd),$this->config['theme']);
    return $pageStr;
  }

}
?>